In the article features of work of monolithic overlap on the profiled flooring, leaning against steel I-beams, reinforced by pre-stressed bar reinforcement are considered. Often, when changing the functional purpose of a building or redevelopment, strengthening the structure of the floor is required to ensure strength. In addition, at spans of more than 7 meters, deflections exceeding the limit values may develop, which lead to a decrease in reliability and durability, and a deterioration in the appearance of the overlappings. The purpose of this study is to find the optimum reinforcement of the floor beams. To strengthen the proposed installation of prestressed reinforcement in the lower girdle of the beam, which increases the strength and reduces the deflections of the beams. In such ceilings, the bending moment from external loads is distributed between the structural elements: the beam and the reinforced concrete overlap, in accordance with the ratio of the stiffnesses of these components. As a result of the study, the optimal diameters of prestressed reinforcement for steel beams by spans from 6 to 9 m were determined and for the calculated linear load from 5 to 30 kN/m. The proposed reinforcement option allows to increase bearing capacity, reduce deflections, reduce labor costs for building reconstruction, and also increase the reliability and durability of the structure.
Keywords: reinforced concrete floor, gain, prestressed reinforcement, I-beams, overlap on profiled flooring